SU1654527A1 - Core barrel - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to mining and is intended for core drilling. The purpose of the invention is to increase the core removal while reducing the time spent on its selection. Snar d has control balls, a spring-loaded differential sleeve and a bore of the sub, which is made stepped. The upper boring level has a diameter smaller than the diameter of the piston. The central channel of the piston is connected with the cavity of the core receiver, the through channels are made with a saddle under the control balls. The piston has a groove on the upper end with a slope to the center and an annular groove along the periphery of the upper end. The annular groove is made with a width not less than the diameter and a height not less than the radius of the control balls. The latter are stationary on the saddles of the through channels in the upper step of the bore of the sub with the possibility of moving in the radial direction along the groove. A spring-loaded differential sleeve is installed in the sub over the control balls with the possibility of longitudinal movement and release with the last end in the lowest position and press it to the side surface of the upper step of the bore of the translator. The projectile shank is made with a conical bore and is mounted with the possibility of longitudinal movement. The elements of the core from the slab are made in the form of wedges. The latter are installed with the possibility of interaction with the conical bore when moving the core receiver relative to the shank. A sub is unscrewed from the body on the surface, after which a core receiver is pulled out of the piston, the core from the cavity of which is removed after the shank is disconnected. 4 sludge. ё ON SP -N SL SL Yu h |

Description

FIELD OF THE INVENTION The invention relates to mining, in particular to devices for drilling wells with coring.

The aim of the invention is to increase the core removal while reducing the time spent on its selection.

FIG. 1 shows a shot, general view, in section; in fig. 2 shows section A-A in FIG. one;

in fig. 3 - shot after the actuation of the drive mechanism, coring, general view; in fig. 4 - the same, after separation of the core from the bottom.

The coring device comprises a housing 1 with a sub 2 for connection to drill pipes (not shown) and a crown 3. In the cavity 4 of the housing 1 a core receiver 5 is placed with a rotation b unit and a tailing tail 7 installed in the lower part 8 of the core receiver 5 with the option a longitudinal movement and a shear pin 9 fixed in the initial position. Inside the shank 7 there is a conical bore 10, above which are located the core separation elements from the bottom, made in the form of wedges 11, fixed in the initial position by a split elastic - formed ring 12. The base of the core receiver 5 at the bottom is carried out by the end face 13 of the shank 7 placed in the bore 14 of the crown 3 for the passage of the solution in which the holes are made 15. The core 1 b is being drilled in the cavity 17 of the core core 5 which is connected through the node 6 of rotation to a piston 18 placed in a bore 19 of the sub 2 and a shear pin 20 fixed in the initial position. In this case, the piston 18 closes the opening 21 made in the wall of the sub 2. In the piston 18 there is a central channel 22 which is blocked by a dropout surfaces by a shut-off valve 23 of the core receiver 5, and through channels 24, placed evenly at the end of the eccentric center channel 22 and blocked by control balls 25. In the open position, the through channel 24 is hydraulically connected with the bore piston 26, which is smaller than the diameter of the hole 19. At the upper end of the piston 18, there is a radial groove 27, which has a bevel 28 inclined to the center of the piston 18, and on the periphery there is an annular groove 29, the width of which is greater than the diameter, and the depth is greater than the radius controlling Above the piston 25. The ball 18 is set in two-sub differential sleeve 30, cooperating with a spring 31 mounted in the cavity 32, communicating with the well bore 33. At the lower position the sleeve 30 lower end 34 cooperates with the ball 25.

The coring device operates as follows.

In the initial position (Fig. 1) without a shut-off valve 23, a projectile on a string of drill pipes (not shown) is lowered to the bottom. At the same time, the tubing is filled with the solution through the core receiver cavity 17, the central channel 22 and the channel of the differential sleeve 30, as well as through the holes 15 of the crown 3, the cavity 4 of the housing 1, the bore 19, the through channel 24, and with the lifting of the control ball 25 bore cavity 26 and channel diff

Potential bushing 30 enters the drill string.

If necessary, intermediate flushing during the descent of the injection solution

will enter the well only through the core receiver cavity 17, thereby preventing the formation of dense clay plugs and accumulation of sludge in it, which during drilling may cut out the core 16. Intermediate flushing is possible at the same time and through the cavity 4, for which the pumps are turned off rotation of the pipe string with snar dom. With

5, by this action of the centrifugal forces, the control balls 25 will be displaced from the saddles of the through channels and along the groove 27 will move in the radial direction along the bevel 28 towards the periphery of the end face of the piston 18

0 all the way to the surface of the bore 26. Due to the fact that the diameter of the bore 26 is less than the diameter of the bore 19, i.e., less than the diameter of the piston 18, the balls 25 will not get into the recess 29. Subsequent

5 by turning on the washing (not stopping the rotation), the sleeve 30 is displaced downward, holding the balls 25 in this position (Fig. 3), after which the rotation is turned off and the washing is performed for the required time through the open through channels 24 and core receiver 5. Before starting the drilling A stop valve 23 is dropped into the pipe string, which, closing the central channel 22, directs the flow of the solution through

5, borehole channels 24, thereby preventing the erosion of the core 16, which is located in the cavity 17 of the core receiver 5.

Core drilling is done with the initial turn of the core.

0 projectile and the subsequent activation of the washing, whereby the control balls 25, moving along the groove 27, will open the through channels 24, and after turning on the washing, they will be held in this position by the end of the sleeve 30.

The drilled core 6 does not interact with the wedges 11 due to their fixation by the ring 12 in the initial position, preventing contact with the core, which

0 ensures the safety of the core and increases the durability of the wedges 11.

At the end of the voyage with core sampling, turn off flushing and rotation. After the return of the balls 25 on the bevel 28 on

5 the saddle of the through channels 24 again turns on the pumps. By force from the increasing pressure of the solution in the closed cavity of the drill string, the piston 18 will move down the bore 19. This will cut the pin 20, and with further

Moving the piston 18 and its associated receiver 5 down, after the stop of the shank 7 into the bore 14 of the crown 3, the pin 9 will be cut. As the core receiver 5 moves, the wedges 11 hinged at the bottom 8 will interact with the conical bore 10 and the deflection The core will be inserted into the core 16, it will not be separated from the bottom. Because of the separation of the core, the movement of the projectile with the drill string is not produced, the entire core column remains in the core receiver 5, which increases the core removal. At the end of the stroke of the piston 18 downwards (FIG. 4), an opening 21 will open, the pressure in the tubing string will decrease. On the surface, the moment of the piston 18 beginning to move with the core receiver 5 is marked on the manometer by a jump in the pressure of the solution in the downstream line. yes is the reduction of pressure and restoration of circulation of drilling mud. After separation of the projectile from the bottom, rotation is turned on, the balls 25 under the action of centrifugal forces, moving along the groove 27 in the radial direction from the center, will fall into the annular point each 29 (FIG. 2), where the spontaneous return them impossible boagstsar mgrov gr. ratio ra-ki choch balloons 29 and 25 thereby, during the ascent of the projectile on ppvg OXHOCTI skmotn Channels 24 are permanently nb. provides free waste 3

COLUMNS OF DRILL PIPES FOR LIFTING ILL

the ability of the solution to circulate during washing through the cavity 4 k o p 11 v c i i turn around 15 crowns which caused the appearance of a bad one, 1 in pi, - t, - as well. tacks, etc.

On the surface of the core yt i otgchm ,, m the south sub 2, after which the core receiver / 5 cores 16 and 17 of the cavity 17 are pulled out of the core 1 and the shank 7 can be removed from the core

Claims (1)

The invention of the use of a coring shell with a crown and adapter COP shaft with drill pipe, mounted in the housing with the possibility of longitudinal movement of the core receiver with the rotation unit, the shank installed in the lower part of the core receiver and interacting with the crown, the elements of separating the core from the bottom are placed on the shank and the drive mechanism in the form of a movable piston installed in the bore of the sub and connected to the rotation unit and having a central channel with a saddle under the gate valve and through channels placed eccentrically a central channel, characterized in that, with a view. increase core removal while reducing the time spent on its selection, it is equipped with control balls and a spring-loaded differential sleeve, the bore of the sub is made stepwise, the top one whose step has a diameter less than the diameter of the piston, the central channel of which is connected to the core receiver, through channels made with a saddle under control balls, and a piston with a groove on the upper end with an inclination to the center and an annular groove on the periphery of the upper end was made with a width not less than the diameter and a height not less than the radius of the control points Sh a P with the spm of the last ,, 1 glacier ercho on the saddles of the through channels in the ve ( .01 and the boring stages of the water-mka surface with a repeating frequency cU .r 1 and in a radial type of captivity and by way of P springs. d, 1 (i | енци1 ту7 tulku stanza in R i т tnik above the manager - crrish /, g with the possibility of longitudinal movement and n inducing with the last mountaineer para i. i lower position and adopting it to Gv, i surface of the upper step par  LCHK1 PGR OODNIK Moreover, the HVOS of the AEI, Vyg, o lH 1 -1 g is a conical hub and is installed with the possibility of longitudinal overhanging, and the core elements of the core oi are made with the slots of the horn or the horn of the horn with interoperability ra; points nepeMi (crown carnimes in a miniature relative to Riga.1 18 Rig.Z eleven Phage.C